﻿//
// Copyright 2023 Google LLC
//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
// 
//   http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
//

using NUnit.Framework;
using System.Security.Cryptography;

namespace Google.Solutions.Platform.Test
{
    /// <summary>
    /// Assertions for dealing with CNG keys.
    /// </summary>
    internal class CngAssert
    {
        public static void AssertEqual(CngAlgorithm algorithm, CngKey lhs, CngKey rhs)
        {
            if (algorithm == CngAlgorithm.Rsa)
            {
                var lhsParams = new RSACng(lhs).ExportParameters(false);
                var rhsParams = new RSACng(rhs).ExportParameters(false);

                CollectionAssert.AreEqual(lhsParams.Modulus, rhsParams.Modulus);
            }
            else
            {
                var lhsParams = new ECDsaCng(lhs).ExportParameters(false);
                var rhsParams = new ECDsaCng(rhs).ExportParameters(false);

                CollectionAssert.AreEqual(lhsParams.Q.X, rhsParams.Q.X);
                CollectionAssert.AreEqual(lhsParams.Q.Y, rhsParams.Q.Y);
            }
        }

        public static void AssertNotEqual(CngAlgorithm algorithm, CngKey lhs, CngKey rhs)
        {
            if (algorithm == CngAlgorithm.Rsa)
            {
                var lhsParams = new RSACng(lhs).ExportParameters(false);
                var rhsParams = new RSACng(rhs).ExportParameters(false);

                CollectionAssert.AreNotEqual(lhsParams.Modulus, rhsParams.Modulus);
            }
            else
            {
                var lhsParams = new ECDsaCng(lhs).ExportParameters(false);
                var rhsParams = new ECDsaCng(rhs).ExportParameters(false);

                CollectionAssert.AreNotEqual(lhsParams.Q.X, rhsParams.Q.X);
                CollectionAssert.AreNotEqual(lhsParams.Q.Y, rhsParams.Q.Y);
            }
        }
    }
}
